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Indoor

/ˈɪndɔː/

Relating to things or activities that happen within buildings, rather than outside.

Synonyms:

Her indoor life had its disadvantages.

They installed an indoor pool at the resort.

Indoor plants thrive better with proper sunlight.

The word indoor originated in the early 18th century as a combination of in, meaning inside, and door, which refers to an entrance or passageway.

37 mentions per 1 million words

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Hint: Frequency according to COCA